package io.renren.utils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.WordUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.renren.entity.ColumnEntity;
import io.renren.entity.TableEntity;

/**
 * 代码生成器   工具类
 *
 * @author chenshun
 * @email sunlightcs@gmail.com
 * @date 2016年12月19日 下午11:40:24
 */
public class GenUtils {
	private static final Logger logger=LoggerFactory.getLogger(GenUtils.class);

    public static List<String> getTemplates(){
        List<String> templates = new ArrayList<String>();
        templates.add("template/Entity.java.vm");
        templates.add("template/Dao.java.vm");
        templates.add("template/Dao.xml.vm");
        templates.add("template/Service.java.vm");
        templates.add("template/ServiceImpl.java.vm");
        templates.add("template/Controller.java.vm");
        templates.add("template/menu.sql.vm");

        templates.add("template/index.vue.vm");
        templates.add("template/add-or-update.vue.vm");

        return templates;
    }

    /**
     * 生成代码
     */
    public static void generatorCode(Map<String, String> table,
                                     List<Map<String, String>> columns, OutputStream os) {
        //配置信息
        Configuration config = getConfig();
        boolean hasBigDecimal = false;
        //表信息
        TableEntity tableEntity = getTableInfo(table, columns, config, hasBigDecimal);

        genFile(os, config, hasBigDecimal, tableEntity);
    }

	/**
	 * @param table
	 * @param columns
	 * @param config
	 * @param hasBigDecimal
	 * @param tableEntity
	 * @return
	 */
	private static TableEntity getTableInfo(Map<String, String> table, List<Map<String, String>> columns,
			Configuration config, boolean hasBigDecimal) {
		TableEntity tableEntity=new TableEntity();
        
        tableEntity.setTableName(table.get("tableName" ));
        tableEntity.setComments(table.get("tableComment" ));
        //表名转换成Java类名
        String className = tableToJava(tableEntity.getTableName(), config.getString("tablePrefix" ));
        tableEntity.setClassName(className);
        tableEntity.setClassname(StringUtils.uncapitalize(className));

		String[] columnExclude = config.getStringArray("columnExclude");
        //列信息
        List<ColumnEntity> columsList = new ArrayList<>();
        for(Map<String, String> column : columns){
            ColumnEntity columnEntity = new ColumnEntity();
            columnEntity.setColumnName(column.get("columnName" ));
            columnEntity.setDataType(column.get("dataType" ));
            columnEntity.setComments(column.get("columnComment" ));
            columnEntity.setExtra(column.get("extra" ));

            //列名转换成Java属性名
            String attrName = columnToJava(columnEntity.getColumnName());
            columnEntity.setAttrName(attrName);
            columnEntity.setAttrname(StringUtils.uncapitalize(attrName));

            //列的数据类型，转换成Java类型
            String attrType = config.getString(columnEntity.getDataType(), "unknowType" );
            columnEntity.setAttrType(attrType);
            if (!hasBigDecimal && attrType.equals("BigDecimal" )) {
                hasBigDecimal = true;
            }
            //是否主键
            if ("PRI".equalsIgnoreCase(column.get("columnKey" )) && tableEntity.getPk() == null) {
                tableEntity.setPk(columnEntity);
            }

            columsList.add(columnEntity);
        }
        tableEntity.setColumns(columsList);

        //没主键，则第一个字段为主键
        if (tableEntity.getPk() == null) {
            tableEntity.setPk(tableEntity.getColumns().get(0));
        }
		return tableEntity;
	}

	private static boolean excludeColumn(String columnName, String[] columnExclude) {
		if (columnName != null && columnExclude != null && columnExclude.length > 0) {
			for (int i = 0; i < columnExclude.length; i++) {
				if (columnName.equals(columnExclude[i])) {
					return true;
				}
			}
		}
		return false;
	}

	public static List<ColumnEntity> getFilterColumns(TableEntity tableEntity, Configuration config) {
		String[] columnExclude = config.getStringArray("columnExclude");
		List<ColumnEntity> list = new ArrayList<ColumnEntity>();
		tableEntity.getColumns().forEach((c) -> {
			if (!excludeColumn(c.getColumnName(), columnExclude)) {
				list.add(c);
			}
		});
		return list;
	}

	public static List<ColumnEntity> getColumns(String fileName, TableEntity tableEntity, Configuration config) {
		//if (fileName.indexOf(".vue") >= 0) {
			return getFilterColumns(tableEntity, config);
		//}
		//return tableEntity.getColumns();
	}

	/**
	 * @param os
	 * @param config
	 * @param hasBigDecimal
	 * @param tableEntity
	 */
	private static void genFile(OutputStream os, Configuration config, boolean hasBigDecimal,
			TableEntity tableEntity) {
		//设置velocity资源加载器
        Properties prop = new Properties();
        prop.put("file.resource.loader.class", "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader" );
        Velocity.init(prop);
        String mainPath = config.getString("mainPath" );
        mainPath = StringUtils.isBlank(mainPath) ? "io.renren" : mainPath;
        //封装模板数据
        Map<String, Object> map = new HashMap<>();
        map.put("tableName", tableEntity.getTableName());
        map.put("comments", tableEntity.getComments());
        map.put("pk", tableEntity.getPk());
        map.put("className", tableEntity.getClassName());
        map.put("classname", tableEntity.getClassname());
        map.put("pathName", tableEntity.getClassname().toLowerCase());
		// map.put("columns", getColumns(fileName, tableEntity, config));
        map.put("hasBigDecimal", hasBigDecimal);
        map.put("mainPath", mainPath);
        map.put("package", config.getString("package" ));
        map.put("moduleName", config.getString("moduleName" ));
        map.put("author", config.getString("author" ));
        map.put("email", config.getString("email" ));
        map.put("datetime", DateUtils.format(new Date(), DateUtils.DATE_TIME_PATTERN));
        VelocityContext context = new VelocityContext(map);

        //获取模板列表
        List<String> templates = getTemplates();
        for (String template : templates) {
			// 添加到zip
			String fileName = getFileName(template, tableEntity.getClassName(), config.getString("package"),
					config.getString("moduleName"));
			logger.info("gen file:{}", fileName);
            //渲染模板
            StringWriter sw = new StringWriter();
            Template tpl = Velocity.getTemplate(template, "UTF-8" );
			context.put("columns", getColumns(fileName, tableEntity, config));
            tpl.merge(context, sw);

            try {
                if(os==null){
					String filePath = config.getString("filePath");
					filePath = filePath == null || "".equals(filePath)
							? GenUtils.class.getResource("/").getPath().replace("/", "\\") : filePath;
					File file = new File(filePath + fileName);
            		if(!file.getParentFile().exists()){
            			file.getParentFile().mkdirs();
            		}
            		logger.info("gen file path:{}",file.getAbsolutePath());
            		FileOutputStream fos=new FileOutputStream(file);
            		IOUtils.write(sw.toString(), fos, "UTF-8" );
            		fos.close();
            	}else if(os instanceof ZipOutputStream){
            		((ZipOutputStream)os).putNextEntry(new ZipEntry(fileName));
                    IOUtils.write(sw.toString(), os, "UTF-8" );
                    ((ZipOutputStream)os).closeEntry();
            	}
                IOUtils.closeQuietly(sw);
            } catch (IOException e) {
                throw new RRException("渲染模板失败，表名：" + tableEntity.getTableName(), e);
            }
        }
	}


    /**
     * 列名转换成Java属性名
     */
    public static String columnToJava(String columnName) {
        return WordUtils.capitalizeFully(columnName, new char[]{'_'}).replace("_", "" );
    }

    /**
     * 表名转换成Java类名
     */
    public static String tableToJava(String tableName, String tablePrefix) {
        if (StringUtils.isNotBlank(tablePrefix)) {
            tableName = tableName.replace(tablePrefix, "" );
        }
        return columnToJava(tableName);
    }

    /**
     * 获取配置信息
     */
    public static Configuration getConfig() {
        try {
            return new PropertiesConfiguration("generator.properties" );
        } catch (ConfigurationException e) {
            throw new RRException("获取配置文件失败，", e);
        }
    }

    /**
     * 获取文件名
     */
    public static String getFileName(String template, String className, String packageName, String moduleName) {
		String packagePath = "src" + File.separator + "main" + File.separator + "java" + File.separator;
		String viewPath = "src" + File.separator + "main" + File.separator + "resources" + File.separator;
		String sqlPath = "sql" + File.separator ;
        if (StringUtils.isNotBlank(packageName)) {
            packagePath += packageName.replace(".", File.separator) + File.separator + moduleName + File.separator;
        }

        if (template.contains("Entity.java.vm" )) {
            return packagePath + "entity" + File.separator + className + "Entity.java";
        }

        if (template.contains("Dao.java.vm" )) {
            return packagePath + "dao" + File.separator + className + "Dao.java";
        }

        if (template.contains("Service.java.vm" )) {
            return packagePath + "service" + File.separator + className + "Service.java";
        }

        if (template.contains("ServiceImpl.java.vm" )) {
            return packagePath + "service" + File.separator + "impl" + File.separator + className + "ServiceImpl.java";
        }

        if (template.contains("Controller.java.vm" )) {
            return packagePath + "controller" + File.separator + className + "Controller.java";
        }

		if (template.contains("Dao.xml.vm" )) {
            return viewPath + "mapper" + File.separator + moduleName + File.separator + className + "Dao.xml";
        }

        if (template.contains("menu.sql.vm" )) {
            return sqlPath+className.toLowerCase() + "_menu.sql";
        }

        if (template.contains("index.vue.vm" )) {
            return viewPath + "src" + File.separator + "views" + File.separator + "modules" +
                    File.separator + moduleName + File.separator + className.toLowerCase() + ".vue";
        }

        if (template.contains("add-or-update.vue.vm" )) {
            return viewPath + "src" + File.separator + "views" + File.separator + "modules" +
                    File.separator + moduleName + File.separator + className.toLowerCase() + "-add-or-update.vue";
        }

        return null;
    }
}
